1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * xfrm_input.c 4 * 5 * Changes: 6 * YOSHIFUJI Hideaki @USAGI 7 * Split up af-specific portion 8 * 9 */ 10 11 #include <linux/bottom_half.h> 12 #include <linux/cache.h> 13 #include <linux/interrupt.h> 14 #include <linux/slab.h> 15 #include <linux/module.h> 16 #include <linux/netdevice.h> 17 #include <linux/percpu.h> 18 #include <net/dst.h> 19 #include <net/ip.h> 20 #include <net/xfrm.h> 21 #include <net/ip_tunnels.h> 22 #include <net/ip6_tunnel.h> 23 #include <net/dst_metadata.h> 24 #include <net/hotdata.h> 25 26 #include "xfrm_inout.h" 27 28 struct xfrm_trans_tasklet { 29 struct work_struct work; 30 spinlock_t queue_lock; 31 struct sk_buff_head queue; 32 }; 33 34 struct xfrm_trans_cb { 35 union { 36 struct inet_skb_parm h4; 37 #if IS_ENABLED(CONFIG_IPV6) 38 struct inet6_skb_parm h6; 39 #endif 40 } header; 41 int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb); 42 struct net *net; 43 }; 44 45 #define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0])) 46 47 static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); 48 static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1]; 49 50 static struct gro_cells gro_cells; 51 static struct net_device xfrm_napi_dev; 52 53 static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet); 54 55 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo) 56 { 57 int err = 0; 58 59 if (WARN_ON(afinfo->family > AF_INET6)) 60 return -EAFNOSUPPORT; 61 62 spin_lock_bh(&xfrm_input_afinfo_lock); 63 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) 64 err = -EEXIST; 65 else 66 rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], afinfo); 67 spin_unlock_bh(&xfrm_input_afinfo_lock); 68 return err; 69 } 70 EXPORT_SYMBOL(xfrm_input_register_afinfo); 71 72 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo) 73 { 74 int err = 0; 75 76 spin_lock_bh(&xfrm_input_afinfo_lock); 77 if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) { 78 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo)) 79 err = -EINVAL; 80 else 81 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL); 82 } 83 spin_unlock_bh(&xfrm_input_afinfo_lock); 84 synchronize_rcu(); 85 return err; 86 } 87 EXPORT_SYMBOL(xfrm_input_unregister_afinfo); 88 89 static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(u8 family, bool is_ipip) 90 { 91 const struct xfrm_input_afinfo *afinfo; 92 93 if (WARN_ON_ONCE(family > AF_INET6)) 94 return NULL; 95 96 rcu_read_lock(); 97 afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][family]); 98 if (unlikely(!afinfo)) 99 rcu_read_unlock(); 100 return afinfo; 101 } 102 103 static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, 104 int err) 105 { 106 bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6); 107 const struct xfrm_input_afinfo *afinfo; 108 int ret; 109 110 afinfo = xfrm_input_get_afinfo(family, is_ipip); 111 if (!afinfo) 112 return -EAFNOSUPPORT; 113 114 ret = afinfo->callback(skb, protocol, err); 115 rcu_read_unlock(); 116 117 return ret; 118 } 119 120 struct sec_path *secpath_set(struct sk_buff *skb) 121 { 122 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH); 123 124 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH); 125 if (!sp) 126 return NULL; 127 128 if (tmp) /* reused existing one (was COW'd if needed) */ 129 return sp; 130 131 /* allocated new secpath */ 132 memset(sp->ovec, 0, sizeof(sp->ovec)); 133 sp->olen = 0; 134 sp->len = 0; 135 sp->verified_cnt = 0; 136 137 return sp; 138 } 139 EXPORT_SYMBOL(secpath_set); 140 141 /* Fetch spi and seq from ipsec header */ 142 143 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) 144 { 145 int offset, offset_seq; 146 int hlen; 147 148 switch (nexthdr) { 149 case IPPROTO_AH: 150 hlen = sizeof(struct ip_auth_hdr); 151 offset = offsetof(struct ip_auth_hdr, spi); 152 offset_seq = offsetof(struct ip_auth_hdr, seq_no); 153 break; 154 case IPPROTO_ESP: 155 hlen = sizeof(struct ip_esp_hdr); 156 offset = offsetof(struct ip_esp_hdr, spi); 157 offset_seq = offsetof(struct ip_esp_hdr, seq_no); 158 break; 159 case IPPROTO_COMP: 160 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) 161 return -EINVAL; 162 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); 163 *seq = 0; 164 return 0; 165 default: 166 return 1; 167 } 168 169 if (!pskb_may_pull(skb, hlen)) 170 return -EINVAL; 171 172 *spi = *(__be32 *)(skb_transport_header(skb) + offset); 173 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); 174 return 0; 175 } 176 EXPORT_SYMBOL(xfrm_parse_spi); 177 178 static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) 179 { 180 struct iphdr *iph; 181 int optlen = 0; 182 int err = -EINVAL; 183 184 skb->protocol = htons(ETH_P_IP); 185 186 if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { 187 struct ip_beet_phdr *ph; 188 int phlen; 189 190 if (!pskb_may_pull(skb, sizeof(*ph))) 191 goto out; 192 193 ph = (struct ip_beet_phdr *)skb->data; 194 195 phlen = sizeof(*ph) + ph->padlen; 196 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); 197 if (optlen < 0 || optlen & 3 || optlen > 250) 198 goto out; 199 200 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr; 201 202 if (!pskb_may_pull(skb, phlen)) 203 goto out; 204 __skb_pull(skb, phlen); 205 } 206 207 skb_push(skb, sizeof(*iph)); 208 skb_reset_network_header(skb); 209 skb_mac_header_rebuild(skb); 210 211 xfrm4_beet_make_header(skb); 212 213 iph = ip_hdr(skb); 214 215 iph->ihl += optlen / 4; 216 iph->tot_len = htons(skb->len); 217 iph->daddr = x->sel.daddr.a4; 218 iph->saddr = x->sel.saddr.a4; 219 iph->check = 0; 220 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 221 err = 0; 222 out: 223 return err; 224 } 225 226 static void ipip_ecn_decapsulate(struct sk_buff *skb) 227 { 228 struct iphdr *inner_iph = ipip_hdr(skb); 229 230 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) 231 IP_ECN_set_ce(inner_iph); 232 } 233 234 static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) 235 { 236 int err = -EINVAL; 237 238 skb->protocol = htons(ETH_P_IP); 239 240 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 241 goto out; 242 243 err = skb_unclone(skb, GFP_ATOMIC); 244 if (err) 245 goto out; 246 247 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 248 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb)); 249 if (!(x->props.flags & XFRM_STATE_NOECN)) 250 ipip_ecn_decapsulate(skb); 251 252 skb_reset_network_header(skb); 253 skb_mac_header_rebuild(skb); 254 if (skb->mac_len) 255 eth_hdr(skb)->h_proto = skb->protocol; 256 257 err = 0; 258 259 out: 260 return err; 261 } 262 263 static void ipip6_ecn_decapsulate(struct sk_buff *skb) 264 { 265 struct ipv6hdr *inner_iph = ipipv6_hdr(skb); 266 267 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) 268 IP6_ECN_set_ce(skb, inner_iph); 269 } 270 271 static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) 272 { 273 int err = -EINVAL; 274 275 skb->protocol = htons(ETH_P_IPV6); 276 277 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 278 goto out; 279 280 err = skb_unclone(skb, GFP_ATOMIC); 281 if (err) 282 goto out; 283 284 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 285 ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb)); 286 if (!(x->props.flags & XFRM_STATE_NOECN)) 287 ipip6_ecn_decapsulate(skb); 288 289 skb_reset_network_header(skb); 290 skb_mac_header_rebuild(skb); 291 if (skb->mac_len) 292 eth_hdr(skb)->h_proto = skb->protocol; 293 294 err = 0; 295 296 out: 297 return err; 298 } 299 300 static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) 301 { 302 struct ipv6hdr *ip6h; 303 int size = sizeof(struct ipv6hdr); 304 int err; 305 306 skb->protocol = htons(ETH_P_IPV6); 307 308 err = skb_cow_head(skb, size + skb->mac_len); 309 if (err) 310 goto out; 311 312 __skb_push(skb, size); 313 skb_reset_network_header(skb); 314 skb_mac_header_rebuild(skb); 315 316 xfrm6_beet_make_header(skb); 317 318 ip6h = ipv6_hdr(skb); 319 ip6h->payload_len = htons(skb->len - size); 320 ip6h->daddr = x->sel.daddr.in6; 321 ip6h->saddr = x->sel.saddr.in6; 322 err = 0; 323 out: 324 return err; 325 } 326 327 /* Remove encapsulation header. 328 * 329 * The IP header will be moved over the top of the encapsulation 330 * header. 331 * 332 * On entry, the transport header shall point to where the IP header 333 * should be and the network header shall be set to where the IP 334 * header currently is. skb->data shall point to the start of the 335 * payload. 336 */ 337 static int 338 xfrm_inner_mode_encap_remove(struct xfrm_state *x, 339 struct sk_buff *skb) 340 { 341 switch (x->props.mode) { 342 case XFRM_MODE_BEET: 343 switch (x->sel.family) { 344 case AF_INET: 345 return xfrm4_remove_beet_encap(x, skb); 346 case AF_INET6: 347 return xfrm6_remove_beet_encap(x, skb); 348 } 349 break; 350 case XFRM_MODE_TUNNEL: 351 switch (XFRM_MODE_SKB_CB(skb)->protocol) { 352 case IPPROTO_IPIP: 353 return xfrm4_remove_tunnel_encap(x, skb); 354 case IPPROTO_IPV6: 355 return xfrm6_remove_tunnel_encap(x, skb); 356 break; 357 } 358 return -EINVAL; 359 } 360 361 WARN_ON_ONCE(1); 362 return -EOPNOTSUPP; 363 } 364 365 static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) 366 { 367 switch (x->props.family) { 368 case AF_INET: 369 xfrm4_extract_header(skb); 370 break; 371 case AF_INET6: 372 xfrm6_extract_header(skb); 373 break; 374 default: 375 WARN_ON_ONCE(1); 376 return -EAFNOSUPPORT; 377 } 378 379 return xfrm_inner_mode_encap_remove(x, skb); 380 } 381 382 /* Remove encapsulation header. 383 * 384 * The IP header will be moved over the top of the encapsulation header. 385 * 386 * On entry, skb_transport_header() shall point to where the IP header 387 * should be and skb_network_header() shall be set to where the IP header 388 * currently is. skb->data shall point to the start of the payload. 389 */ 390 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) 391 { 392 struct xfrm_offload *xo = xfrm_offload(skb); 393 int ihl = skb->data - skb_transport_header(skb); 394 395 if (skb->transport_header != skb->network_header) { 396 memmove(skb_transport_header(skb), 397 skb_network_header(skb), ihl); 398 if (xo) 399 xo->orig_mac_len = 400 skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0; 401 skb->network_header = skb->transport_header; 402 } 403 ip_hdr(skb)->tot_len = htons(skb->len + ihl); 404 skb_reset_transport_header(skb); 405 return 0; 406 } 407 408 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) 409 { 410 #if IS_ENABLED(CONFIG_IPV6) 411 struct xfrm_offload *xo = xfrm_offload(skb); 412 int ihl = skb->data - skb_transport_header(skb); 413 414 if (skb->transport_header != skb->network_header) { 415 memmove(skb_transport_header(skb), 416 skb_network_header(skb), ihl); 417 if (xo) 418 xo->orig_mac_len = 419 skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0; 420 skb->network_header = skb->transport_header; 421 } 422 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - 423 sizeof(struct ipv6hdr)); 424 skb_reset_transport_header(skb); 425 return 0; 426 #else 427 WARN_ON_ONCE(1); 428 return -EAFNOSUPPORT; 429 #endif 430 } 431 432 static int xfrm_inner_mode_input(struct xfrm_state *x, 433 struct sk_buff *skb) 434 { 435 switch (x->props.mode) { 436 case XFRM_MODE_BEET: 437 case XFRM_MODE_TUNNEL: 438 return xfrm_prepare_input(x, skb); 439 case XFRM_MODE_TRANSPORT: 440 if (x->props.family == AF_INET) 441 return xfrm4_transport_input(x, skb); 442 if (x->props.family == AF_INET6) 443 return xfrm6_transport_input(x, skb); 444 break; 445 case XFRM_MODE_ROUTEOPTIMIZATION: 446 WARN_ON_ONCE(1); 447 break; 448 default: 449 WARN_ON_ONCE(1); 450 break; 451 } 452 453 return -EOPNOTSUPP; 454 } 455 456 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 457 { 458 const struct xfrm_state_afinfo *afinfo; 459 struct net *net = dev_net(skb->dev); 460 int err; 461 __be32 seq; 462 __be32 seq_hi; 463 struct xfrm_state *x = NULL; 464 xfrm_address_t *daddr; 465 u32 mark = skb->mark; 466 unsigned int family = AF_UNSPEC; 467 int decaps = 0; 468 int async = 0; 469 bool xfrm_gro = false; 470 bool crypto_done = false; 471 struct xfrm_offload *xo = xfrm_offload(skb); 472 struct sec_path *sp; 473 474 if (encap_type < 0 || (xo && xo->flags & XFRM_GRO)) { 475 x = xfrm_input_state(skb); 476 477 if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) { 478 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR); 479 goto drop; 480 } 481 482 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 483 if (x->km.state == XFRM_STATE_ACQ) 484 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 485 else 486 XFRM_INC_STATS(net, 487 LINUX_MIB_XFRMINSTATEINVALID); 488 489 if (encap_type == -1) 490 dev_put(skb->dev); 491 goto drop; 492 } 493 494 family = x->props.family; 495 496 /* An encap_type of -1 indicates async resumption. */ 497 if (encap_type == -1) { 498 async = 1; 499 seq = XFRM_SKB_CB(skb)->seq.input.low; 500 goto resume; 501 } 502 /* GRO call */ 503 seq = XFRM_SPI_SKB_CB(skb)->seq; 504 505 if (xo && (xo->flags & CRYPTO_DONE)) { 506 crypto_done = true; 507 family = XFRM_SPI_SKB_CB(skb)->family; 508 509 if (!(xo->status & CRYPTO_SUCCESS)) { 510 if (xo->status & 511 (CRYPTO_TRANSPORT_AH_AUTH_FAILED | 512 CRYPTO_TRANSPORT_ESP_AUTH_FAILED | 513 CRYPTO_TUNNEL_AH_AUTH_FAILED | 514 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { 515 516 xfrm_audit_state_icvfail(x, skb, 517 x->type->proto); 518 x->stats.integrity_failed++; 519 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 520 goto drop; 521 } 522 523 if (xo->status & CRYPTO_INVALID_PROTOCOL) { 524 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 525 goto drop; 526 } 527 528 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 529 goto drop; 530 } 531 532 if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { 533 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 534 goto drop; 535 } 536 } 537 538 goto lock; 539 } 540 541 family = XFRM_SPI_SKB_CB(skb)->family; 542 543 /* if tunnel is present override skb->mark value with tunnel i_key */ 544 switch (family) { 545 case AF_INET: 546 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 547 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); 548 break; 549 case AF_INET6: 550 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 551 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); 552 break; 553 } 554 555 sp = secpath_set(skb); 556 if (!sp) { 557 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 558 goto drop; 559 } 560 561 seq = 0; 562 if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { 563 secpath_reset(skb); 564 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 565 goto drop; 566 } 567 568 daddr = (xfrm_address_t *)(skb_network_header(skb) + 569 XFRM_SPI_SKB_CB(skb)->daddroff); 570 do { 571 sp = skb_sec_path(skb); 572 573 if (sp->len == XFRM_MAX_DEPTH) { 574 secpath_reset(skb); 575 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 576 goto drop; 577 } 578 579 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); 580 if (x == NULL) { 581 secpath_reset(skb); 582 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); 583 xfrm_audit_state_notfound(skb, family, spi, seq); 584 goto drop; 585 } 586 587 if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) { 588 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR); 589 xfrm_state_put(x); 590 goto drop; 591 } 592 593 skb->mark = xfrm_smark_get(skb->mark, x); 594 595 sp->xvec[sp->len++] = x; 596 597 skb_dst_force(skb); 598 if (!skb_dst(skb)) { 599 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 600 goto drop; 601 } 602 603 lock: 604 spin_lock(&x->lock); 605 606 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 607 if (x->km.state == XFRM_STATE_ACQ) 608 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 609 else 610 XFRM_INC_STATS(net, 611 LINUX_MIB_XFRMINSTATEINVALID); 612 goto drop_unlock; 613 } 614 615 if ((x->encap ? x->encap->encap_type : 0) != encap_type) { 616 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); 617 goto drop_unlock; 618 } 619 620 if (xfrm_replay_check(x, skb, seq)) { 621 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 622 goto drop_unlock; 623 } 624 625 if (xfrm_state_check_expire(x)) { 626 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); 627 goto drop_unlock; 628 } 629 630 spin_unlock(&x->lock); 631 632 if (xfrm_tunnel_check(skb, x, family)) { 633 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 634 goto drop; 635 } 636 637 seq_hi = htonl(xfrm_replay_seqhi(x, seq)); 638 639 XFRM_SKB_CB(skb)->seq.input.low = seq; 640 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; 641 642 dev_hold(skb->dev); 643 644 if (crypto_done) 645 nexthdr = x->type_offload->input_tail(x, skb); 646 else 647 nexthdr = x->type->input(x, skb); 648 649 if (nexthdr == -EINPROGRESS) 650 return 0; 651 resume: 652 dev_put(skb->dev); 653 654 spin_lock(&x->lock); 655 if (nexthdr < 0) { 656 if (nexthdr == -EBADMSG) { 657 xfrm_audit_state_icvfail(x, skb, 658 x->type->proto); 659 x->stats.integrity_failed++; 660 } 661 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 662 goto drop_unlock; 663 } 664 665 /* only the first xfrm gets the encap type */ 666 encap_type = 0; 667 668 if (xfrm_replay_recheck(x, skb, seq)) { 669 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 670 goto drop_unlock; 671 } 672 673 xfrm_replay_advance(x, seq); 674 675 x->curlft.bytes += skb->len; 676 x->curlft.packets++; 677 x->lastused = ktime_get_real_seconds(); 678 679 spin_unlock(&x->lock); 680 681 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; 682 683 if (xfrm_inner_mode_input(x, skb)) { 684 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 685 goto drop; 686 } 687 688 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { 689 decaps = 1; 690 break; 691 } 692 693 /* 694 * We need the inner address. However, we only get here for 695 * transport mode so the outer address is identical. 696 */ 697 daddr = &x->id.daddr; 698 family = x->props.family; 699 700 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); 701 if (err < 0) { 702 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 703 goto drop; 704 } 705 crypto_done = false; 706 } while (!err); 707 708 err = xfrm_rcv_cb(skb, family, x->type->proto, 0); 709 if (err) 710 goto drop; 711 712 nf_reset_ct(skb); 713 714 if (decaps) { 715 sp = skb_sec_path(skb); 716 if (sp) 717 sp->olen = 0; 718 if (skb_valid_dst(skb)) 719 skb_dst_drop(skb); 720 gro_cells_receive(&gro_cells, skb); 721 return 0; 722 } else { 723 xo = xfrm_offload(skb); 724 if (xo) 725 xfrm_gro = xo->flags & XFRM_GRO; 726 727 err = -EAFNOSUPPORT; 728 rcu_read_lock(); 729 afinfo = xfrm_state_afinfo_get_rcu(x->props.family); 730 if (likely(afinfo)) 731 err = afinfo->transport_finish(skb, xfrm_gro || async); 732 rcu_read_unlock(); 733 if (xfrm_gro) { 734 sp = skb_sec_path(skb); 735 if (sp) 736 sp->olen = 0; 737 if (skb_valid_dst(skb)) 738 skb_dst_drop(skb); 739 gro_cells_receive(&gro_cells, skb); 740 return err; 741 } 742 743 return err; 744 } 745 746 drop_unlock: 747 spin_unlock(&x->lock); 748 drop: 749 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); 750 kfree_skb(skb); 751 return 0; 752 } 753 EXPORT_SYMBOL(xfrm_input); 754 755 int xfrm_input_resume(struct sk_buff *skb, int nexthdr) 756 { 757 return xfrm_input(skb, nexthdr, 0, -1); 758 } 759 EXPORT_SYMBOL(xfrm_input_resume); 760 761 static void xfrm_trans_reinject(struct work_struct *work) 762 { 763 struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work); 764 struct sk_buff_head queue; 765 struct sk_buff *skb; 766 767 __skb_queue_head_init(&queue); 768 spin_lock_bh(&trans->queue_lock); 769 skb_queue_splice_init(&trans->queue, &queue); 770 spin_unlock_bh(&trans->queue_lock); 771 772 local_bh_disable(); 773 while ((skb = __skb_dequeue(&queue))) 774 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, 775 NULL, skb); 776 local_bh_enable(); 777 } 778 779 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 780 int (*finish)(struct net *, struct sock *, 781 struct sk_buff *)) 782 { 783 struct xfrm_trans_tasklet *trans; 784 785 trans = this_cpu_ptr(&xfrm_trans_tasklet); 786 787 if (skb_queue_len(&trans->queue) >= READ_ONCE(net_hotdata.max_backlog)) 788 return -ENOBUFS; 789 790 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); 791 792 XFRM_TRANS_SKB_CB(skb)->finish = finish; 793 XFRM_TRANS_SKB_CB(skb)->net = net; 794 spin_lock_bh(&trans->queue_lock); 795 __skb_queue_tail(&trans->queue, skb); 796 spin_unlock_bh(&trans->queue_lock); 797 schedule_work(&trans->work); 798 return 0; 799 } 800 EXPORT_SYMBOL(xfrm_trans_queue_net); 801 802 int xfrm_trans_queue(struct sk_buff *skb, 803 int (*finish)(struct net *, struct sock *, 804 struct sk_buff *)) 805 { 806 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); 807 } 808 EXPORT_SYMBOL(xfrm_trans_queue); 809 810 void __init xfrm_input_init(void) 811 { 812 int err; 813 int i; 814 815 init_dummy_netdev(&xfrm_napi_dev); 816 err = gro_cells_init(&gro_cells, &xfrm_napi_dev); 817 if (err) 818 gro_cells.cells = NULL; 819 820 for_each_possible_cpu(i) { 821 struct xfrm_trans_tasklet *trans; 822 823 trans = &per_cpu(xfrm_trans_tasklet, i); 824 spin_lock_init(&trans->queue_lock); 825 __skb_queue_head_init(&trans->queue); 826 INIT_WORK(&trans->work, xfrm_trans_reinject); 827 } 828 } 829